if u are intending to design a pcb for this, have the traces much thicker.. especially for the ground, you should build a ground bus ca 1cm thick, so that you dont have any stray- loop currents through your pcb..

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i am currently using 60,000 uF of capacitance in my preamplifier..

Originally posted by costiss if u are intending to design a pcb for this, have the traces much thicker.. especially for the ground, you should build a ground bus ca 1cm thick, so that you dont have any stray- loop currents through your pcb..

OK, thanks!!
I have redone it with a 6.38 Ground, its the biggest expressPCB will do and if it was bigger it would be tricky to fit under the diodes.

TL431's cost about $0.25 each and they are a great reference/error amplifier -- much quieter than the 7815/7951 -- the schematic below is gilding the lilly -- you don't need the post regulators (LT17161 LT1964 ultra-low noise -- they are surface mount anyway). This design will cost less and handle more current, the reference is set as Vout = 2.495*(1+R1/R2):
I give credit to Elso for the first part of the design, I modded it for the parts which I have on hand,